Dependency Injection in Azure Functions results "Unable to resolve service for type..." error

Hi,

I had a azure function running when it suddenly didn’t and returned the error: Unable to resolve service for type... Which is surprising for I have other azure functions with DI running without issue.

All functions work fine in local system.

[brettsam]

@ThapaMahesh – can you check that this host file is being deployed to Azure? It doesn’t appear that it is, and you’re running into a bug that was introduced recently when a host.json file is missing. It causes us to incorrectly inject the usage of extensions bundles, which means we’re not calling your startup class.

We see this in your logs, which means that there was no host.json, so we generated one for you:

Host configuration file read:
{
  "version": "2.0",
  "extensionBundle": {
    "id": "Microsoft.Azure.Functions.ExtensionBundle",
    "version": "[1.*, 2.0.0)"
  }
}

If you make sure to deploy the default host.json from above, it should get back to working again.

//cc @soninaren

[ThapaMahesh]

@siji147 the host file contains { "version": "2.0" }